EK-TM4C1294XL: Hiw to modify project usb_dev_cserial for 4 virtual serial

Hi,

  Does the original usb_dev_cserial as-is work?

Well, It works. I just sent a carachter on first virtual device, and received on UART0, than I send on 2nd virtual device and viewed echo.

Then I modified for 4 serial ports. Windows sees the 4 ports. First virtual keep on working as before, and 2nd virtual works. But in first virtual if I send 9 characters all once it crashes.

3rd virtual does a sort of echo and reply also invalid command, and 4th virtual when i try to send crashes.

Can you help me in some way?

My first doubt is that the device cannot support 4 USB virtual but in the datasheet it says it can support composite device with maximum 8 interfaces. and I have 4 rx interfaces and 4 tx interfaces.

Best Regards

Three ports works perfectly.